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21A-121R900 Won't stay running

I changed primer bulb, filter, and carb diaphram. Will start w/closed choke, but open choke and it stalls. I need help!

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  • Harold Boyce Feb 23, 2012

    Hello Pamabell; I did add new Primer,Filter, Fuel Lines,and Diaphram. As you stated the carb might need cleaning.I also might need to get new carb mounting gasket. Thanks for your input, Harold

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Hello sir, my machine will only start when pumping primmer bulb or squirting fluid in the carburetor than stops. the fuel line has broken off, in most small carburetors this is a ongoing problem.old fuel will crystallize when left in tank for a long time.plugging up ports, fuel lines, small screen in carburetor.fuel lines will dissolve clogging carb.this is why it will run when the choke is on creating a vacuum to where there is fuel forced in the carb to rum,also the gas will evaporate leaving the oil behind clogging up carb.the thing to do is remove carb. and clean out,replacing gaskets or fuel line if necessary.use carb cleaner to clean out carb.make sure to make note where fuel line go.the fuel filter broke off of fuel line letting debris get in carb plugging it up.the muffler is known to clog up a lot on these machines where they want run. the compression should be 60 to 120 lbs any thing below 60 is junk. when adjusting the carb screws turn in all the way than turnout 1 1/4 turns turn in slow until machine runs also you need to check for spark by removing plug and grounding against engine to check spark, ok.a new spark plug would be a good ideal too , if you are going to make these repairs use new fuel line and filter,hope this helps,any comments welcome,thank you, ~~

Posted on Feb 21, 2012

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Posted on Jan 02, 2017

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SOURCE: 21a-121r900 Yard machines tiller. Flywheel key

You can download manuals here. Find your serial number also.
http://manuals.mtdproducts.com/mtd/Public.do?langId=-1&BrandCode=10451
Most motors have an soft woodruff key for flywheel,but this ond looks like it's splined, if it is the right model.

Posted on Aug 19, 2010

  • 81 Answers

SOURCE: replaced gas line and primer bulb. cleaned carb,

If the engine dies when you try to speed it up chances are your muffler is the problem. Any equipment that uses a gas/oil will eventually have a stopped up muffler due to carbon buildup. This restricts the air flow and the engine won't run or open up. First take the muffler off and see if you can start and adjust the carb with it off. Turn both the air and the gas adjustment screws all the way in, then back them both out one and a quarter turns. Start from there.
Unstop the muffler by throwing it in an open fire for 10 to 15 mins or using a torch to burn the carbon out. There is a screen in the muffler that I would toss out (unless you live in California) for the only purpose it serves is catching carbon. Let the muffler cool on its own, don't cool with water or you will warp it and it won't seal right. Also while the muffler is off check the muffler port and scrape off any buildup there with a knife. Hope this helps.

Posted on Jun 19, 2009

  • 468 Answers

SOURCE: primer bulb will not ciphon fuel to carb

Two cycle engines don't prime the same way that 4 cycles do. A 4 cycle engine shoots fuel into the intake, and a two-stroke like what you have, pressurizes the carburetor and removes air. When you press it, it should harden, and then will slowly let fuel bypass the carb and go back into the fuel tank. Because of the ports and the design of a 2 stroke, shooting fuel into the intake would be bad for the engine.

Posted on Mar 29, 2010

Testimonial: "I still don't know why my unit wont start though. Thank you for the information, and have a great day."

  • 208 Answers

SOURCE: Model SV-4 from 1989.

See if this video will assist you. If the carb adjustments are the same it should.


http://www.alamia.us/mantis_parts_s/148.htm

Posted on Feb 20, 2011

  • 3074 Answers

SOURCE: My Yard Machine Tiller starter rope will not

you can either drill the rivet out, or inside the shroud there are metal tabs that you can bend out, but be careful as not to break them off. Hope this helped Tim

Posted on Feb 27, 2011

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Well I finally got my saw running - it occured to me that my older chainsaw never had a primer bulb - so I bypassed it and...pull started it with the choke on till it chugged - then turned the choke off and held the gas full on - pulled the starter cord and was cutting trees - LOL

I did speak with a small engine guy - he explained that the primer is to pressurize the gas tank - so your return line from the carb goes to the suction side of the primer bulb - output to the tank - and pickup line with filter goes to the intake of the carb - FYI - hope it helps ya!!!!!!!!!!

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